How do you measure success in influencer marketing campaigns?

Via tracking link but you need to set up objectives.

It has to be through a tracking link or affiliate code. If not, then you could see if revenue was increased, but this is much less accurate.

Foe me, It's when I see people actually using or wearing the stuff the influencer is promoting.

I guess it's about how much the campaign makes people feel connected to the brand

I measure it by how much the influencer's audience trusts their recommendation.